[Bug 303140]

[Kai Engert]

I had a brief look.

Our existing code doesn't work for signed messages.

When allowing to execute our code on a signed message, we create a
corrupted message structure, where the plain/html message part is
appended at the end of the message structure - after the trailing MIME
layer boundary. As a result, those text is no longer shown.

This was with the simple signature structure that uses MIME layering.

Someone would have to write new code for rewriting such messages.
And that code would have to handle both the simple MIME layering (where the original MIME text is directly visible inside the message, and an additional signature part is present ) and also the opaque signing transport mechanism (where a single MIME part contains the transported data inside a binary encoding).

This isn't deliberately preventing anyone from using the feature, it's
because nobody has written the code that would be required to implement
deatching/deleting for signed messages.

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https://bugs.launchpad.net/bugs/303140

Title:
  No more "Save all" / "detach all" / "delete all" for attachments

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